Holder for wire drawing dies



Jan. 1, 1935. o. SJOGREN HOLDER FOR WIRE DRAWING DIES Filed July 8, 19352 Sheets-Sheet l Patented Jan. 1, 1935 UNITED STATES PATENT. 4 OFFICEHOLDER FOR wmE DRAWING 'nms Oscar Sjogren, Auburn, Mass.

Application July 8, 1933, Serial No. 679,478

3 Claims. (01.205-25) This invention relates to dies for drawing wiresof small diameter and particularly to holders for such wire drawingdies. Dies for this purpose were formerly made by mounting a diamond ina suitable die block and drilling a fine hole therethrough.

More recently, special steel alloys have been used in place of dies andhave been found quite satisfactory as long as the temperature of the dieis not unduly raised. If a steel die becomes highly heated, however, thelife of the dieis greatly shortened and the quality of the wire is muchimpaired.

While the desirability of operating the steel dies at relatively lowtemperature has been recognized, much difliculty'ha been encountered inmaintaining this operating condition, due to the necessarily 'heatedstate of the wire itself and also due to the heat generated by frictionas the wire is drawn through the die. a

It is the general object of my invention to provide means for coolingthe die andfor maintaining a uniform'and relatively low temperature ofthe die during wire drawing operation thereof.

More specifically, I provide for cooling the die by circulation of waterthrough the die block holder. I also provide improved devices forsecuring the die block in the holder and for accomplishing easy andrapid removal and replace- 30 ment of the die block in the holder.

My invention further relates to-arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

35 in the drawings, in which Fig. 1 is a plan .view of wire drawingmechanism embodying my invention; r

Fig. 2 is a plan view of my improved die block 10 holder;

Fig. 3 is a sectional plan view thereof; Fig. 4 is a plan view of theholder with the clamping means removed;

Fig. 5 is a side elevation of the holder; I I Fig. 6 is a transversesectional view, taken along the lines 66 in Fig. 4;

Fig. '7 is an enlarged transverse sectional view of the die block, theholder and the clamping means; i1

Fig. 8 is an end view of theclampin'g means; Fig. 9 is a plan view ofthe die block and die;

Fig/l0 is a transverse sectional view, taken along the line 10-"10 inFig. 9; 1

'Fig. .11 is a longitudinal sectional viewof the 55 clamping device;

. is drawn to reduce it to a desired size.

,A' preferred form of the invention is shown Fig. .12 is a detail viewof an end portion of the clamping screw, partly in section, and

Fig. 13 is an enlarged view showing the manner of assembling certain ofthe parts .shown in Fig. 12. 5

Referring to Fig. 1, I have shown a wire W passing successively throughwire drawing devices A and B and around intermediate guide pulleys 18.Each wire drawing device A'or B comprises a die 20 (Fig. 10) mounted ina recess in a die block 10 21. These dies 20 are commonly formed of aspecial steel alloy which is extremely hard and of great durability. Theusual small opening 22 is formed in the die 20 through which the wire W15 A holder 24 is provided for the, die block21. This holder is providedwith a chamber 25 (Fig. 7) and also with aligned openings 26 and 27 andwith a recess 28. The opening 27 is of greater diameter than the dieblock 21 and the die block 0 fits loosely in' the recess 28 and iscentered thereby with the opening26. An inlet pipe30 and an outlet pipe31 are connected to the chamber a 25 as shown in Fig. 3 and a partition32 is provided between the inlet and the outlet. 25

This partition 32 has an outwardly curved surface 23 which deflects thewater or other cooling liquid so as to give it a rotary motion, andwhich also reduces the flow opening around the end of the partition soas to increase'the speed of the 30 liquid as it engages thedie.

A special clamping device is provided for securing the die block 21 inoperative position in the holder 24. For this purpose I provide abushing 40 (Fig. 11) threaded to receive a clamping screw 41 andprovided with outwardly projecting clamp-g ing flanges 42. These flangeshave helical outer faces 43 (Fig; '7) which engage ears or projections45 on the holder. These ears have helical inner faces 46 corresponding.tothe faces 43.

The flanges 42 and projections 45 are both segmental and constitutequick-acting means for securing the bushing 40 in the holder 24. Thisop-,

eration is readily accomplished by turning the flanges 43 to atransverse position and moving the 46 bushing axially inward until theunder faces of the flanges 42 engage the outer surface of the I holder24. If the bushing is then turned, the flanges 24 engage the projectionsand firmly seat and hold the bushing in position. The bush- 60 ing 40 isprovided with a portion 48 towhich a wrench may be applied forfirmlyseating the bushing and the clamping screw 41 is similarly provided witha portion 49 to receive a wrench.

'The clamping screw 41 is threaded into the end of the screw 41 ispreferably provided with a wear plate (Fig. 12) which may be of arelatively soft metal and which directly engages the die block 21.

The screw 41 and wear plate 50 are provided with axial passages for thewire and a bushing 52 is preferably mounted in a recess 53 in the outerend of the clamping screw 41 so as to properly guide the wire at theouter end of the bushing. 7

In Figs. 12 and 13 I have shown a convenient manner of assembling thescrew 41 and wear. plate 50. A recess (Fig. 13) is formed in the outerend of the screw 41 and is provided with an under out side wall. Thewear plate 50 is preferably formed with a pronounced outward curve ordish and fits snugly within the outer edge portion of the wall of therecess 60.

The wear plate 50 is then flattened by a blow or pressure thereon andthis flattening of the wear plate causes the edges of the plate to beforced outward into the undercut recess 60, thus securing the wear platefrom displacement but permitting its removal when it becomes worn and anew wear plate is desired.

With the construction above described, a'die block 21 may bevery-quickly and easily secured in position by inserting and seating thebushin 40, and then applying pressure through the clamping screw 41 tocause the wear plate 50 to firmly engage the die block 21 and to seatthe same firmly in the recess 28.

When the parts are thus assembled, there is a free and continuouspassage through the holder for the wire W, while at the same time thedie and die block are water-cooled but without permitting any escape ofwater from the holder exofi valve 73. The pipes and 71 are also pro-Vvided with shut-off valves 74 and '75.

Under normal operating conditions, the valves '73 in the supply pipe 72will be closed and the valves '74 and 75 will be open so that the waterwill flow successively through each die block holder in series. If,however, it is desired to remove the die in a selected holder, thatparticular holder may be out out of the circuit by closing the valves'74 and '75 and opening the valve 73, after which the selected dieholderis out of circuit while the remaining die holders of the seriesoperate as usual and the water supply thereto is not interrupted.

While it is preferred to use water, it is to be understood that anyother suitable cooling liquid may be used.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is 1. Wire drawing meanscomprising a die block, a holder therefor, said holder having a coolingchamber, means to secure said block in said chamber, means to conduct acooling liquid to and from saidchamber, and means in said chamber toseparate the in-fiow and out-flow of liquid in said chamber, said meansalso reducing the cross section of the passage for liquid at one pointthereof and correspondingly increasing the rat of liquid flow at saidpoint.

2. Wire drawing means comprising a 'die block holder having a coolingchamber with an inlet 1 one of said openings, a bushing,quick-detachable means to secure said bushing in said second opening,and'a clamping member threaded in said bushing and engaging said dieblock.

3. Wire drawing means comprising a die block holder having a coolingchamber with an inlet and outlet for a cooling liquid and with alignedopenings in two' walls thereof, a die block seated in said chamber andaligned with and covering one of said openings, a bushing,quick-detachable means to secure said bushing in said second opening,and a clamping member threaded in .said bushing and engaging said dieblock, said clamping member having an axial guiding opening for thewire.

OSCAR SJOGREN.

